SSuuppeerr BB FFaaccttoorryy PrProospspeeccttss
Steven Robertson
IPP Town Hall Meeting June 4th , 2005 TThhee ssuucccceessss ooff tthhee BB facfacttoorriieess
● Since 1999 both SLAC and KEK B factories have performed well above design expectations
● Belle and BABAR physics programs have been extremely sucessful: → Precise tests of KM picture for CPV: – sin2β= +0.726±0.037 is now a precise measurement (~5%). – The other angles are being seriously constrained ∆ – UT side measurements: |Vcb|, |Vub|. md → 145 BABAR papers submitted to date (~135 Belle)
– CKM, inclusive spectra, exclusive B, charm and τ decays, exotic states...
Paradigm change: look for alternatives to CKM ~300fb-1(KEKB) → Corrections by New Physics ? ~250fb-1(PEP-II)
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 2 HiHinnttss ooff NNeeww PhPhyyssiiccss??
Anomalous CP violation? Tree decay b c Belle + BaBar, 2005 J/ψ _ W c B_ s d _ d KS
Ave. CPV = 0.726±0.037
Equal 3.7σ deviation if only SM observed
Ave. CPV = 0.41±0.07 W
top
η penguin decay - f x Sf Adapted from M.Yamauchi (KEK)
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 3 BABARBABAR/PEP-/PEP-IIII SSttatatuuss
● BABAR “Run 5” started mid-April
– Rapid vaccum scrubbing and recovery of luminosity (7x1033 reached by early May) Run 7
● Run continuously until summer 2006 Run 6
– Double current dataset (~500fb-1) Run 5
● Aug-Nov 2006 shutdown for vacuum, RF and 2005-2008 PEP-II BABAR LST upgrades integrated luminosity projection
● Runs 6&7 from Nov 2006 – Sept 2008
– Ultimate dataset of >1000fb-1
Parameter Present Future Lumi gain ratio Hardware and work needed
LER current 2450 mA 4500 mA Two RF stations, new IR vacuum chambers HER current 1550 mA 2200 mA 1.61 Two RF stations, new IR vacuum chambers β * 10.5 mm 8.5 mm 1.24 HER higher tunes, RF & power y supplies work ξ 0.065 L 0.070 L 1.17 Tune plane, coupling, & IR y 0.043 H 0.055 H work
Total x 2.3 June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 4 SSuuppeerrBB
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 5 WWhhatat iiss SSuuppererBB??
● Existing asymmetric B factories expect to each accumulate data samples of O(1ab-1) by end of nominal physics program (~2008)
– World data sample of ~2x109 BB pairs will be more than sufficient to validate CKM picture of CP violation in B decays – Insufficient to rule out non-SM contributions, which could appear as unitarity triangle discrepancies or in the non-CP sector (i.e. rare decays)
● Super B physics program seeks to reduce experimental uncertainties in the B sector to level of “irreducible” theoretical uncertainties (i.e. exhaust the physics potential of the B sector)
– Many New Physics scenarios have non-negligible effects in the heavy flavour sector, hence SuperB would contribute valuable information even if non-SM effects are first observed at LHC – Irreducible uncertainty limit is reached (depending on mode) with data samples of typically a few to O(100) ab-1
● Separate SuperBABAR & SuperKEKB initiatives aimed at 3- 7x1035 luminosity with expectation that (at most) one will be built
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 6 SSuuppeerrBB eexxppeerriimmeennttalal iissssuueess
+ - ● Primary advantages of an e e collider over hadron machines are the inclusive trigger and clean environment
– Ability to perform inclusive measurements, exclusive hadronic decays, neutrals reconstruction – Need tracking, calorimetry and PID comparable to present BABAR/Belle 36 ● At ~1x10 expect ~50kHz of bhabhas within detector acceptance plus ~5kHz of “irreducible” qq of which ~1kHz is BB signal
– Need to veto bhabha events at level 1 – High-level trigger, dataflow and event reconstruction must handle (continuous!) event rate of several kHz
● Radiation environment and detector occupancy (primarily from beam backgrounds) become comparable to hadron colliders
– Need fast, rad hard, highly segmented detectors to cope with background occupancy – However, no “pileup” from physics events June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 7 SSuupeperrBBABARABAR woworrkk
36 ● Snowmass “10 whitepaper” (2002): D.Hitlin and A. Roodman(ed.) “Physics at a 1036 Asymmetric B Factory”, SLAC-PUB-8970 (Aug 2001).
36 ● SLAC “10 ” Super B workshops (May 2003 and Oct 2003): J. Hewett, (ed.) et al., “The Discovery potential of a Super B Factory”, Proceedings, SLAC Workshops, Stanford USA, 2003. SLAC-R-709 (Dec 2004) 483p.; hep-ph/0503261.
● SLAC “scenarios” study
● BABAR high-luminosity task force studies:
– “Long term planning”, BABAR internal report (2003)
– “Roadmap committee” BABAR internal report (2004)
● NAS summary report: G. Dubois-Felsman et al., “Flavour Physics in the Next Decade” (May 2005)
● Joint BABAR/Belle workshops
– January 2004 (Hawaii)
– April 2005 (Hawaii) http://www/phys.hawaii.edu/superb
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 8 BABABBAARR →→ SSuuppeerrBBABARABAR
35 ● BABAR/PEP-II proposal to upgrade to ~7x10 luminosity by ~2012 for ultimate dataset of >50billion BB pairs
Approval
R&D, Design, Proposals Construction of Super B Operation Super-B and Approvals upgrades to Program L = 5-7x1035 ~10ab-1/year 2001 2003 2005 2006 2008 2010 2011 2012
Construction LOI CDR Installation P5 Commissioning Planned PEP-II Program
SuperBABAR disfavoured by current political/financial situation...
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 9 SSuuppeerr PPEP-EP-IIII ppararamameetteerrss
Super B Super B-factory IR LER energy 3.5 GeV 30
HER energy 8.0 GeV QF5 QF2 LER current 23.0 A 20 QD4 HER current 10.1 A LER β * QD1 y 1.5 mm 10 QD1 HER β * cm x 15 cm 0 40 kW X emittance 40 nm-rad 200 kW Estimated σ * 1.7 µm y -10
Bunch spacing 0.315 m 83 kW 11 kW Number of bunches 6900 QD4 -20 QF2 Collision angle ±14 mrads QF5
Beam pipe radius 2.5 cm -30
-5 0 5 E36_2_5M_8_RL Luminosity 1×1036 cm−2 sec−1 m M. Sullivan, Jan. 16, 2004
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 10 SSuuppeerrBABARBABAR ddeetteeccttoorr
Replace encap RPCs IFNLSUTXR RUEMTENURTEDN
Rad-hard crystal (LSO?) or Liquid Xenon
Focusing DIRC SOLENO ID (smaller radius, no SOB) LXe EMC
- DIR C + All Si tracking SITRLAICOKERN (pixel or striplet)
DCRHAIABFLMTESBER
R
35 ● Aggressive ~7x10 luminosity target:
– More contingency for high background running conditions
– More extensive detector upgrade and R&D required
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 11 SSuuppeerrKEKB/BeKEKB/Bellllee
● Six workshops to discuss physics, detector and accelerator issues
– 2001, Aug: 1st workshop at KEK
– 2002, Jan (KEK)
– 2002, Aug (Shonan)
– 2003, Feb (KEK) – 2003, Sep (Shuzenji) s hor – 2004, Nov (KEK) aut – A.G.Akeroyd et al. (SuperKEKB physics 268 working group), “Physics at Super B Factory”, hep-ex/0406071 (July 2004) 191p.
● Letter of Intent for KEK Super B Factory (KEK Report 2004-4)
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 12 KKEEKBKB →→ SSuuppeerrKEKBKEKB J-PARC 1 construction ILC construction Construct. T2K fund SuperKEKB const. Operation fund Crab cavity KEKB >1000fb-1 machine KEKB “Major” upgradeSuperKEKB Belle “Minor” upgrade 2004 05 06 07 08 09 10 11 12 Calendar year
× 34 -2 -1 10 Lpeak = 1.4 10 cm s ~10 BB/year !! & similar number of τ+τ-
Major upgrade of KEKB & Belle detector (>1yr shutdown) Crab cavities
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 13 SSuuppeerrBeBellllee DeDetteeccttoorr (ba(basseelineline))
CsI(Tl) 16X0 Aerogel Cherenkov counter SC solenoid →pure CsI (endcap) + TOF counter 1.5T →”TOP” + RICH µ / KL detection 14/15 lyr. RPC+Fe →tile scintillator
New readout and Tracking + dE/dx small cell + He/C H computing 2 5 → fast gas, remove systems inner lyrs
35 ● Maximum lumi of ~3x10
– Relatively little contingency for high background rate Si vtx. Det. 4 lyr. DSSD → 2 pixel/striplet lyrs. + 4 lyr. DSSD – Less substantial detector rebuild June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 14 PhPhyyssiiccss MMoottiivvatatiioonn
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 15 BB pphhyyssiiccss iinn tthhee LLHCHC eerraa
● Once NP found in B/LHC, the next question would be What is the NP scenario ?
● Orthogonality of B physics to LHC... The squark/slepton mass matrix is sensitive to the SUSY breaking mechanism: SUSY breaking terms Quark mass: Squark mass:
Off-diagonal terms Flavor Physics Luminosity frontier q 2 2 2 q%i % j q qi j m11 m12 m13 (m 2 ) ( m2 ) = m2 m2 m2 q% 23(13) q% ij 21 22 23 Diagonal terms: cf) Top quark: 2 2 2 LHC/ILC m m m Mass/width by Tevatron 31 32 33 Energy frontier Mixing/phase by B factories
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 16 NNeeww PhPhyyssiiccss ssiiggnnatatuurreess (2003 SLAC WS Proceedings)
SUSY
Large Extra Dimension model
Different pattern of the deviations from the SM prediction. Correlation with other physics observables.
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 17 ““DDNNAA cchhiipp”” foforr SSUSUSYY bbrreakieakingng
) tanb erate b) (mod e tan GRA ( larg mSU RA ith nR SUG UT w m SY G USY ) SU tive S SU(5 Effec ange exch s viton nsion K gra ime K xtra d sions rge e imen in la tra d ions ions al ex ens it ferm ivers a dim Spl Un l extr ersa Univ y itarit un ion Bd iolat v cays ent de pend are nals e-de BR r sig CTiPm Othe
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 18 SSuuppeerr BB vvss LLHCbHCb:: ee.g..g. BB0 →→ ππ+ππ--
1.00E+04 0.20
0.19 s
t 9.00E+03 0.18 n
e 0.17
8.00E+03 0.16 ev e σ (Sππ) Lint 0.15 d
7.00E+03 0.14 ud t ge li g 0.13 p a
t 6.00E+03 0.12 m a
f 0.11
o e
5.00E+03 0.10 n 0.09 i er s
b 4.00E+03 0.08 PEP-II, KEKB Super B-Factory 10/2011 n
0.07 o um
n 3.00E+03 0.06 r o e 0.05 r v
2.00E+03 0.04 Er ti SuperB c LHCb 0.03 1.00E+03 0.02
Effe BTEV 0.01
0.00E+00 0.00 7 9 1 3 3 4 5 6 8 0 0 2 3 4 4 5 4 5 6 7 8 9 1 2 3 5 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 ------l- l l- l- l- l- l- l- l l l l l n n n n n n n n n n n n n n u u u u u u u u u u u u u a a a a a a a a a a a a a a J J J J J J J J J J J J J J J J J J J J J J J J J J J
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 19 SSuuppeerrKEKBKEKB pphhyyssiiccss rreeacachh Physics at Super B Factory (hep-ex/0406071) SuperKEKB 5ab-1 50ab-1 LHCb 2fb-1 ) s → b (
V P C NC C F ν
/ w M K C
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 20 CoConncclluussiioonnss
● Asymmetric B factories have been overwhelmingly successful, but will not exhaust the New Physics sensitivity of the B sector
– Proposed SuperB Factories would reduce experimental uncertainies by an order of magnitude, strongly constraining NP scenarios
● Competitive with (and complementary to) LHCb in physics sensitivity and timescale
– ~2012 startup would provide dialog with LHC wrt New Physics discoveries, but would not interfere strongly with ILC preparations
● SLAC project disfavoured and KEK proposal not currently funded:
– Strongly coupled to geopolitics of ILC, ITER etc., local politics of labs...
– Initial “approval” needed by around 2007 (i.e. likely before clear evidence of NP emerges), but project already on critical path for timely startup
● Canadian involvement?
– Guarded expression of interest from some BABARians...
– Likely no firm committment needed until ~end of BABAR program since to date SuperB work has proceeded within BABAR/Belle. Wait and see?
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 21 BacBackukupp sslliiddeess
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 22 SSoouurrcceess
● SuperBABAR material taken from presentations by D.Hitlin, D.Macfarlane, J.Seeman and other BABAR/SuperBABAR sources
nd ● SuperKEKB/Belle material taken from presentations at the 2 Super B Factory Workshop in Hawaii (April 20-22):
– http://www/phys.hawaii.edu/superb
● Other references:
– NAS summary report G. Dubois-Felsman et al., “Flavour Physics in the Next Decade”
– A.G.Akeroyd et al. (SuperKEKB physics working group), “Physics at Super B Factory”, hep-ex/0406071 (July 2004) 191p.
– J. Hewett, (ed.) et al., “The Discovery potential of a Super B Factory”, Proceedings, SLAC Workshops, Stanford USA, 2003. SLAC-R-709 (Dec 2004) 483p.; hep-ph/0503261.
– S. Hashimoto, (ed.) et al., “Letter of Intent for KEK Super B Factory. KEK-REPORT-2004-4 (Jun 2004) 546.”
● BABAR Roadmap committee report (BABAR internal report) 2004.
36 ● Snowmass proceedings and SuperB “10 whitepaper” (2002): D.Hitlin and A. Roodman (ed.) “Physics at a 1036 Asymmetric B Factory”, SLAC-PUB-8970 (Aug 2001). SSUSUSYY anandd FFllavavoorr PhPhyyssiiccss
● SUSY models introduce SUSY partners. ● Squark mass matrixes are new sources of flavor mixing and CP violation. ● Squark masses depend on SUSY breaking terms.
Quark mass SUSY breaking terms Squark mass
Diagonal term: LHC/ILC
Off-diagonal term: Flavor exp
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 24 SSququararkk mmasasss mmatatrriixx (d(d sseeccttoorr))
Super B Factory
LHC
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 25 ElEluucciiddatatiioonn ooff NNPP SScceennarariioo
● T. Goto, Y.Okada, Y.Shimizu,T.Shindou, M.Tanaka, hep-ph/0306093, also in SuperKEKB LoI
y onl 1 ih tingus dis to rd ss Ha ma 2 th wi 3
4
Can we distinguish these 4 senarios at Super-KEKB?
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 26 DDiiffffeerreenntt aassssuumpmpttiioonnss oonn tthhee SSUUSSYY bbrreeaakkiinngg sseectctoorr
Minimal Flavor Violation (ex. mSUGRA)
SUSY GUT with see-saw neutrinos
SUSY breaking Flavor symmetry
Effective SUSY etc.
How to distinguish these models from B factory observables?
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 27 NNeeww PhPhyyssiiccss ssiiggnnatatuurreess
Model B Time-dep. d Rare B decay Other signals Unitarity CPV mSUGRA (moderate tan β) - - - -
mSUGRA mixing - τν µµ Bd B → (D)* Bs → (large tan β) + − b → s l l Bs mixing SUSY GUT with ν B → φK B mixing R - S - s τ B → K∗γ LFV, n EDM Effective SUSY mixing φ γ mixing Bd B → KS ACP (b→s ) Bs b → s l+ l− KK graviton - - b → s l+ l− - exchange Split fermions in - + − mixing Bd mixing b → s l l large extra mixing dimensions Bulk fermions in + − Bd mixing B → φK b → s l l Bs mixing warped extra S mixing dimensions
Universal extra b → s l+ l− Κ → πνν dimensions - - b → sγ
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 28 PPaatttteerrnn ooff tthhee ddeevviiaattiioonn ffrroomm tthhee SSMM pprreeddiictctiioonnss ffoorr tthhrreeee SSUUSSYY momoddeellss..
Yasuhiro Okada (KEK) Super B Factory Workshop in Hawaii, April 20, 2005
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 29 PPoossssiibbllee ddeevviiaattiioonnss ffrroomm tthhee SSMM ffoorr SSPPSS ppaarraamemetteerrss iinn SSUU((55)) GGUUTT wwiitthh RRHNHN
Yasuhiro Okada (KEK) Super B Factory Workshop in Hawaii, April 20, 2005 June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 30 SSeennssiittiivviittyy foforr ChChararggeedd HiHiggggss
Constraint from B→Xs γ B→Dτν
% 5 ~ ) r o % t 5 1 ac f ~ - r) m to r fac Fo - ( m ∆ r B→τν Fo LHC ∆( (present) 100fb-1
∆(form-factor) can be reduced with the present B→Dµν data.
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 31 LLeeppttoonn FFllavavoorr ViVioollatatiioonn
LFV in neutrino sector ⇒LFV in charged leptons ? Search for “SM Zero”
γ w/ improvement Extrapolation Present CLEO τ lγ χ %0 τ lγ τ τ% µ%(e%) µ(e) 2 τ lπ/η/η’ (ml% )23(13) τ τ 3l, lη 3l τ µ τ l Ks
h µ(s) τ B γ/π
µ(s )
B-factory = “Tau-factory” 1010 τ pairs at -1 Search region enters into O(10-8 10-9) June 4, 200510abSuper B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 32 BB →→ K*K* γγ s 1.00E+04 0.20 t
n 0.19 e 9.00E+03 PEP-II, KEKB Super B-Factory 10/0.120118 0.17 e ev 8.00E+03 0.16 d d u e 0.15 t g 7.00E+03 0.14 li g p
a 0.13 t 6.00E+03 0.12 m
f 0.11 e a
o 5.00E+03 0.10 n
0.09 i er s 4.00E+03 0.08 b
0.07 n um 3.00E+03 0.06 o n r 0.05
2.00E+03 0.04 ro ve
i 0.03 Er t
c 1.00E+03 SuperB 0.02
e 0.01
ff 0.00E+00 0.00 7 9 1 3 3 4 4 5 5 6 6 7 8 8 9 0 0 1 2 2 3 3 4 4 5 5 6 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 ------E l- l l- l- l- l- l- l- l l l l l n n n n n n n n n n n n n n u u u u u u u u u u u u u a a a a a a a a a a a a a a J J J J J J J J J J J J J J J J J J J J J J J J J J J
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 33 EEvolvolutiutionon iiff NNeeww PPhyshysiiccss hihinntsts aarree rreeaall
Combined hints are 3.7σ averaged over Penguin modes
By 2006, BABAR result could be anywhere from 3-5σ Combined B Factory result anywhere from 4-6σ
By 2008, BABAR result would average 3-4σ for individual modes Combined B Factory results would be 4-5σ
By 2010, start to discriminate between New Physics models
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 34 GGlloobbaall CCKMKM ffiitt:: 20082008
σ σ ∆ σ β σ α o σ δ o (Vub ) ~ 8% ( ms ) ~ 5% (sin 2 ) ~ 0.019 ( ) ~ 6 ( ) ~ 10
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 35 SSuuppeerrKKEKEKBB pphhyyssiicscs rreeacachh
SuperKEKB LoI hep-ex/0406071
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 36 SSuuppeerrBeBellllee uuppggrradadee ssuummmmararyy
● Vertexing detector: “striplet” + APV25 or pixel ● Central drift chamber: small cell + faster gas ● PID device: TOP(B) + Aerogel RICH(E)
● EM calorimeter: Pure CsI + tetrode (E)
● Scintillator KLM
● Pipelined DAQ
● Greatly expanded computing system
● β × 35 2 Increase NB, decrease y*, and crab crossing: L=3.5 10 /cm /s . New beam pipe, crab cavity, new injector with damping ring.
● JFY2009 and 2010, US$450M
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 37 SSuuppeerr KEKBKEKB ppararamameetteerrss
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 38 SSuuppeerrKEKBKEKB acaccceelleerratatoorr Interaction Region Crab crossing New Beam pipe θ=30mrad. βy*=3mm 8GeV (e+, 4.1A) New QCS ξ γ I± ±y R L≈ ± L β* 2eer y Ry More RF power
Increase beam currents Damping ring •1.6 A (LER) / 1.2 A (HER) → 9.6 A (LER) / 4.1 A (HER) β * Linac upgrade Smaller y • 6 mm→3 mm ξ 35 -2 -1 Increase y L=3.5x10 cm s • 0.05→0.28(W-S)
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 39 SuperKEKB Machine Parameters bare lattice with beambeam unit Beam current (LER/HER) I 9.4/4.1 A Beam energy (LER/HER) E 3.5/8.0 GeV
Emittance εx 24 128 nm
Horizontal beta at IP βx* 20 2.3 cm
Vertical beta at IP βy* 3 2.4 mm σ Horizontal beam size x* 69 dynami54 cal effectμsm Vertical beam size σy* 0.73 1.23 μm * * Beam size ratio r = σy /σx 1.1 2.3 % Crossing angle (30 mrad θx 0 mrad crab crossing)
Luminosity reduction RL 0.86 0.82
ξx reduction Rξx 0.99 0.97
ξy reduction Rξy 1.11 1.16
Reduction ratio RL/Rξy 0.78 0.72 Horizontal beambeam ξ (estimated with SS simulation) x 0.152 0.041 Vertical beambeam ξ (estimated with SS simulation) y 0.215 0.187 Luminosity L 4.0 x 1035 cm2s1 CrCrabab ccavaviittiieess anandd vvacacccuuuumm
● Head-on collision w/ Crab cavity New crab cavity
Will be tested in 2006.
Ante-chamber /solenoid for reduction of electron clouds
CircuAlAannr-tteche--chchamaabmmebbreerr with solenoid field Build-up of electron clouds
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 41 SSuuppeerrKEKBKEKB ccoosstt
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 42 TheThe ccaablblee brbreeaakk aarearea
●
230 kV lines
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 43 TThehe ttrereee thathatt ffeell:ll:3333 mm ttaallll..
●
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 44 ● If SUSY is realized in Nature, LHC is likely to provide some evidence. Then, determination of the SUSY breaking sector becomes one of the most important questions. ● B physics is essential for determining the flavor structure of SUSY breaking terms. ● There are a variety of ways to look for SUSY effects in B decays. ● In order to distinguish different SUSY models, we need to see pattern of deviations from the SM predictions in various processes. For this purpose, a Super B factory is necessary along with hadron B experiments.
Yasuhiro Okada (KEK) Super B Factory Workshop in Hawaii, April 20, 2005
June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 45 June 4, 2005 Super B Factory Prospects IPP Town Hall Meeting Steven H. Robertson 46